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A sphere of radius 0.1m and mass 8 pi ...

A sphere of radius ` 0.1m` and mass `8 pi` `kg` is attached to the lower end of a steel wire of length `5.0 m` and diameter `10^(-3)m`. The wire is suspended from `5.22 m` high ceiling of a room . When the sphere is made to swing as a simple pendulum, it just grazes the floor at its lowest point. Calculate the velocity of the sphere at the lowest position . Young's modulus of steel is `(1.994xx10^(11) N//m^(2))`.

A

`7.7ms^(-1)`

B

`4.4ms^(-1)`

C

`2.2ms^(-1)`

D

`8.8ms^(-1)`

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The correct Answer is:
D
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